down routines be at least 10 pixels on each side.

and identity_matrix() functions.

regularization at a constant level even when exponential forgetting is
used.

have sizes which aren't powers of 2.

numbers in the same manner as MATLAB.

hand arguments if they are complex numbers.  This way they do a proper
cross-correlation and also mirror the behavior of MATLAB.

when the BLAS bindings were enabled.  In particular, expressions which
involved a 1x1 matrix sometimes didn't compile.

values for different labels.